Revised: January 7, 2009

131

© 2009 Littelfuse, Inc.

Specifications are subject to change without notice.

Radial Lead Fuses

272/273/274/278/279 Series

Please refer to www.littelfuse.com/series/272.html, /273.html, /274.html,

/278.html or /279.html for current information.

MICRO™ > Very Fast-Acting > 272/273/274/278/279 Series

Description

Developed originally for the U.S. Space Program,

MICRO™ fuse provides reliability in a compact design.

The MICRO™ fuse is available in plug–in or radial lead

styles and a complete range of ampere ratings from

1/500 to 5A to suit a wide variety of design needs.

Agency Approvals

Agency

Agency File Number

Ampere Range

E10480

2mA - 5A

LR 29862

2mA - 5A

QPL

FM02

2mA - 5A

Features

Electrical Characteristics

Applications

QPL

% of Ampere

Rating

Ampere Rating

OpeningTime

100%

1/500–5

4 Hours, Min.

200%

1/500–3/10

5 Seconds, Max.

4/10-5

2 Seconds, Max.

Ampere

Rating

(A)

Amp Code

(for all

above

series)

Max

Voltage

Rating

(V)

Interrupting

Rating

Nominal

Cold

Resistance

(Ohms)

Nominal

Melting

Agency Approvals

QPL

.002

.002

125

10,000 amperes at

125 VAC/VDC.

2200

0.00000000845

XXX

.005

.005

125

280

0.00000000810

XXX

.010

.010

125

80.0

0.000000462

XXX

.015

.015

125

44.0

0.00000123

XXX

.031

.031

125

16.0

0.00000810

XXX

.050

.050

125

3.20

0.0000666

XXX

.062

.062

125

2.32

0.000115

XXX

.100

.100

125

1.25

0.000385

XXX

.125

.125

125

1.0

0.000691

XXX

.200

.200

125

2.30

0.00409

XXX

.250

.250

125

1.75

0.00640

XXX

.300

.300

125

1.25

0.00945

XXX

.400

.400

125

0.227

0.0251

XXX

.500

.500

125

0.167

0.0716

XXX

.600

.600

125

0.430

0.0411

XXX

.700

.700

125

0.324

0.0710

XXX

.750

.750

125

0.293

0.0900

XXX

.800

.800

125

0.271

0.113

XXX

1.00

001.

125

0.0880

0.0648

XXX

01.5

01.5

125

0.0578

0.160

XXX

2.00

002.

125

0.0425

0.300

XXX

3.00

003.

125

0.0275

0.759

XXX

4.00

004.

125

0.0202

1.38

XXX

5.00

005.

125

0.0156

2.21

XXX

Electrical Characteristics

Military grade available

High breaking capacity

Clear cover option to view

fuse element status

Available from very low

ampere of 2mA to 5A

Plug-in with short or long

leads option

Printed circuit boards

and similar equipment

Electronic components